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Finding the Fourth Proportional to 390,607.80, 539,088.42 and 218,535.30

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Solution

The fourth proportional to 390,607.80, 539,088.42 and 218,535.30 is: 301,606.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,607.80 : 539,088.42 = 218,535.30 : x
  2. Step 2: Convert to fraction form
    390,607.80/539,088.42 = 218,535.30/x
  3. Step 3: Cross multiply
    390,607.80x = 539,088.42 × 218,535.30
  4. Step 4: Simplify right side
    390,607.80x = 117,809,849,591.23
  5. Step 5: Solve for x
    x = 117,809,849,591.23/390,607.80
  6. Step 6: Final answer
    x = 301,606.50

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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.