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Finding the Fourth Proportional to 1,156.88, 1,734.76 and 387.12

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Solution

The fourth proportional to 1,156.88, 1,734.76 and 387.12 is: 580.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,156.88 : 1,734.76 = 387.12 : x
  2. Step 2: Convert to fraction form
    1,156.88/1,734.76 = 387.12/x
  3. Step 3: Cross multiply
    1,156.88x = 1,734.76 × 387.12
  4. Step 4: Simplify right side
    1,156.88x = 671,560.29
  5. Step 5: Solve for x
    x = 671,560.29/1,156.88
  6. Step 6: Final answer
    x = 580.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.