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Finding the Fourth Proportional to 390,957.12, 539,475.36 and 218,884.80

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Solution

The fourth proportional to 390,957.12, 539,475.36 and 218,884.80 is: 302,035.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,957.12 : 539,475.36 = 218,884.80 : x
  2. Step 2: Convert to fraction form
    390,957.12/539,475.36 = 218,884.80/x
  3. Step 3: Cross multiply
    390,957.12x = 539,475.36 × 218,884.80
  4. Step 4: Simplify right side
    390,957.12x = 118,082,956,278.53
  5. Step 5: Solve for x
    x = 118,082,956,278.53/390,957.12
  6. Step 6: Final answer
    x = 302,035.57

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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.