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Finding the Fourth Proportional to 319,421.20, 478,728.60 and 161,693.20

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Solution

The fourth proportional to 319,421.20, 478,728.60 and 161,693.20 is: 242,335.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    319,421.20 : 478,728.60 = 161,693.20 : x
  2. Step 2: Convert to fraction form
    319,421.20/478,728.60 = 161,693.20/x
  3. Step 3: Cross multiply
    319,421.20x = 478,728.60 × 161,693.20
  4. Step 4: Simplify right side
    319,421.20x = 77,407,159,265.52
  5. Step 5: Solve for x
    x = 77,407,159,265.52/319,421.20
  6. Step 6: Final answer
    x = 242,335.70

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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.