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Finding the Fourth Proportional to 487,221.20, 730,831.80 and 319,259.60

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Solution

The fourth proportional to 487,221.20, 730,831.80 and 319,259.60 is: 478,889.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,221.20 : 730,831.80 = 319,259.60 : x
  2. Step 2: Convert to fraction form
    487,221.20/730,831.80 = 319,259.60/x
  3. Step 3: Cross multiply
    487,221.20x = 730,831.80 × 319,259.60
  4. Step 4: Simplify right side
    487,221.20x = 233,325,068,135.28
  5. Step 5: Solve for x
    x = 233,325,068,135.28/487,221.20
  6. Step 6: Final answer
    x = 478,889.40

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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.