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Finding the Fourth Proportional to 718,873, 992,044.76 and 400,921

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Solution

The fourth proportional to 718,873, 992,044.76 and 400,921 is: 553,270.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,873 : 992,044.76 = 400,921 : x
  2. Step 2: Convert to fraction form
    718,873/992,044.76 = 400,921/x
  3. Step 3: Cross multiply
    718,873x = 992,044.76 × 400,921
  4. Step 4: Simplify right side
    718,873x = 397,731,577,223.96
  5. Step 5: Solve for x
    x = 397,731,577,223.96/718,873
  6. Step 6: Final answer
    x = 553,270.99

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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.