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Finding the Fourth Proportional to 487,213.40, 730,820.10 and 319,251.80

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Solution

The fourth proportional to 487,213.40, 730,820.10 and 319,251.80 is: 478,877.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    487,213.40 : 730,820.10 = 319,251.80 : x
  2. Step 2: Convert to fraction form
    487,213.40/730,820.10 = 319,251.80/x
  3. Step 3: Cross multiply
    487,213.40x = 730,820.10 × 319,251.80
  4. Step 4: Simplify right side
    487,213.40x = 233,315,632,401.18
  5. Step 5: Solve for x
    x = 233,315,632,401.18/487,213.40
  6. Step 6: Final answer
    x = 478,877.70

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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.