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Finding the Fourth Proportional to 319,991.48, 479,980.74 and 83,328.92

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Solution

The fourth proportional to 319,991.48, 479,980.74 and 83,328.92 is: 124,991.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,991.48 : 479,980.74 = 83,328.92 : x
  2. Step 2: Convert to fraction form
    319,991.48/479,980.74 = 83,328.92/x
  3. Step 3: Cross multiply
    319,991.48x = 479,980.74 × 83,328.92
  4. Step 4: Simplify right side
    319,991.48x = 39,996,276,685.00
  5. Step 5: Solve for x
    x = 39,996,276,685.00/319,991.48
  6. Step 6: Final answer
    x = 124,991.69

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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.