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Finding the Fourth Proportional to 1,423.47, 2,135.51 and 557.79

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Solution

The fourth proportional to 1,423.47, 2,135.51 and 557.79 is: 836.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,423.47 : 2,135.51 = 557.79 : x
  2. Step 2: Convert to fraction form
    1,423.47/2,135.51 = 557.79/x
  3. Step 3: Cross multiply
    1,423.47x = 2,135.51 × 557.79
  4. Step 4: Simplify right side
    1,423.47x = 1,191,166.12
  5. Step 5: Solve for x
    x = 1,191,166.12/1,423.47
  6. Step 6: Final answer
    x = 836.80

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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.