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Finding the Fourth Proportional to 516,085.20, 774,127.80 and 397,987.20

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Solution

The fourth proportional to 516,085.20, 774,127.80 and 397,987.20 is: 596,980.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    516,085.20 : 774,127.80 = 397,987.20 : x
  2. Step 2: Convert to fraction form
    516,085.20/774,127.80 = 397,987.20/x
  3. Step 3: Cross multiply
    516,085.20x = 774,127.80 × 397,987.20
  4. Step 4: Simplify right side
    516,085.20x = 308,092,955,564.16
  5. Step 5: Solve for x
    x = 308,092,955,564.16/516,085.20
  6. Step 6: Final answer
    x = 596,980.80

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.