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Finding the Fourth Proportional to 709,011.18, 978,446.97 and 386,721.21

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Solution

The fourth proportional to 709,011.18, 978,446.97 and 386,721.21 is: 533,681.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    709,011.18 : 978,446.97 = 386,721.21 : x
  2. Step 2: Convert to fraction form
    709,011.18/978,446.97 = 386,721.21/x
  3. Step 3: Cross multiply
    709,011.18x = 978,446.97 × 386,721.21
  4. Step 4: Simplify right side
    709,011.18x = 378,386,196,159.23
  5. Step 5: Solve for x
    x = 378,386,196,159.23/709,011.18
  6. Step 6: Final answer
    x = 533,681.57

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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.