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Finding the Fourth Proportional to 516,008.40, 774,012.60 and 390,037.20

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Solution

The fourth proportional to 516,008.40, 774,012.60 and 390,037.20 is: 585,055.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    516,008.40 : 774,012.60 = 390,037.20 : x
  2. Step 2: Convert to fraction form
    516,008.40/774,012.60 = 390,037.20/x
  3. Step 3: Cross multiply
    516,008.40x = 774,012.60 × 390,037.20
  4. Step 4: Simplify right side
    516,008.40x = 301,893,707,268.72
  5. Step 5: Solve for x
    x = 301,893,707,268.72/516,008.40
  6. Step 6: Final answer
    x = 585,055.80

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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.