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Finding the Fourth Proportional to 1,402.47, 1,934.31 and 905.16

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Solution

The fourth proportional to 1,402.47, 1,934.31 and 905.16 is: 1,248.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,402.47 : 1,934.31 = 905.16 : x
  2. Step 2: Convert to fraction form
    1,402.47/1,934.31 = 905.16/x
  3. Step 3: Cross multiply
    1,402.47x = 1,934.31 × 905.16
  4. Step 4: Simplify right side
    1,402.47x = 1,750,860.04
  5. Step 5: Solve for x
    x = 1,750,860.04/1,402.47
  6. Step 6: Final answer
    x = 1,248.41

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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.