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Finding the Fourth Proportional to 643,358.90, 887,763.66 and 356,807.18

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Solution

The fourth proportional to 643,358.90, 887,763.66 and 356,807.18 is: 492,354.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,358.90 : 887,763.66 = 356,807.18 : x
  2. Step 2: Convert to fraction form
    643,358.90/887,763.66 = 356,807.18/x
  3. Step 3: Cross multiply
    643,358.90x = 887,763.66 × 356,807.18
  4. Step 4: Simplify right side
    643,358.90x = 316,760,448,031.08
  5. Step 5: Solve for x
    x = 316,760,448,031.08/643,358.90
  6. Step 6: Final answer
    x = 492,354.19

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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.