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Finding the Fourth Proportional to 696,647.84, 961,385.04 and 390,792.20

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Solution

The fourth proportional to 696,647.84, 961,385.04 and 390,792.20 is: 539,299.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    696,647.84 : 961,385.04 = 390,792.20 : x
  2. Step 2: Convert to fraction form
    696,647.84/961,385.04 = 390,792.20/x
  3. Step 3: Cross multiply
    696,647.84x = 961,385.04 × 390,792.20
  4. Step 4: Simplify right side
    696,647.84x = 375,701,774,828.69
  5. Step 5: Solve for x
    x = 375,701,774,828.69/696,647.84
  6. Step 6: Final answer
    x = 539,299.42

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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.