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Finding the Fourth Proportional to 709,911.08, 979,717 and 387,651.12

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Solution

The fourth proportional to 709,911.08, 979,717 and 387,651.12 is: 534,980.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,911.08 : 979,717 = 387,651.12 : x
  2. Step 2: Convert to fraction form
    709,911.08/979,717 = 387,651.12/x
  3. Step 3: Cross multiply
    709,911.08x = 979,717 × 387,651.12
  4. Step 4: Simplify right side
    709,911.08x = 379,788,392,333.04
  5. Step 5: Solve for x
    x = 379,788,392,333.04/709,911.08
  6. Step 6: Final answer
    x = 534,980.23

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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.