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Finding the Fourth Proportional to 390,885.32, 539,447.82 and 218,818.55

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Solution

The fourth proportional to 390,885.32, 539,447.82 and 218,818.55 is: 301,984.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,885.32 : 539,447.82 = 218,818.55 : x
  2. Step 2: Convert to fraction form
    390,885.32/539,447.82 = 218,818.55/x
  3. Step 3: Cross multiply
    390,885.32x = 539,447.82 × 218,818.55
  4. Step 4: Simplify right side
    390,885.32x = 118,041,189,773.06
  5. Step 5: Solve for x
    x = 118,041,189,773.06/390,885.32
  6. Step 6: Final answer
    x = 301,984.20

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.