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Finding the Fourth Proportional to 708,624, 977,901.12 and 390,672

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Solution

The fourth proportional to 708,624, 977,901.12 and 390,672 is: 539,127.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,624 : 977,901.12 = 390,672 : x
  2. Step 2: Convert to fraction form
    708,624/977,901.12 = 390,672/x
  3. Step 3: Cross multiply
    708,624x = 977,901.12 × 390,672
  4. Step 4: Simplify right side
    708,624x = 382,038,586,352.64
  5. Step 5: Solve for x
    x = 382,038,586,352.64/708,624
  6. Step 6: Final answer
    x = 539,127.36

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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.