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Finding the Fourth Proportional to 643,889.69, 888,387.71 and 402,417.56

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Solution

The fourth proportional to 643,889.69, 888,387.71 and 402,417.56 is: 555,223.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,889.69 : 888,387.71 = 402,417.56 : x
  2. Step 2: Convert to fraction form
    643,889.69/888,387.71 = 402,417.56/x
  3. Step 3: Cross multiply
    643,889.69x = 888,387.71 × 402,417.56
  4. Step 4: Simplify right side
    643,889.69x = 357,502,808,138.16
  5. Step 5: Solve for x
    x = 357,502,808,138.16/643,889.69
  6. Step 6: Final answer
    x = 555,223.69

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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.