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Finding the Fourth Proportional to 1,252, 1,877.85 and 430.26

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Solution

The fourth proportional to 1,252, 1,877.85 and 430.26 is: 645.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,252 : 1,877.85 = 430.26 : x
  2. Step 2: Convert to fraction form
    1,252/1,877.85 = 430.26/x
  3. Step 3: Cross multiply
    1,252x = 1,877.85 × 430.26
  4. Step 4: Simplify right side
    1,252x = 807,963.74
  5. Step 5: Solve for x
    x = 807,963.74/1,252
  6. Step 6: Final answer
    x = 645.34

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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.