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Finding the Fourth Proportional to 1,423.76, 2,135.65 and 557.47

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Solution

The fourth proportional to 1,423.76, 2,135.65 and 557.47 is: 836.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.76 : 2,135.65 = 557.47 : x
  2. Step 2: Convert to fraction form
    1,423.76/2,135.65 = 557.47/x
  3. Step 3: Cross multiply
    1,423.76x = 2,135.65 × 557.47
  4. Step 4: Simplify right side
    1,423.76x = 1,190,560.81
  5. Step 5: Solve for x
    x = 1,190,560.81/1,423.76
  6. Step 6: Final answer
    x = 836.21

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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.