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Finding the Fourth Proportional to 1,251.65, 1,875.41 and 429.47

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Solution

The fourth proportional to 1,251.65, 1,875.41 and 429.47 is: 643.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.65 : 1,875.41 = 429.47 : x
  2. Step 2: Convert to fraction form
    1,251.65/1,875.41 = 429.47/x
  3. Step 3: Cross multiply
    1,251.65x = 1,875.41 × 429.47
  4. Step 4: Simplify right side
    1,251.65x = 805,420.81
  5. Step 5: Solve for x
    x = 805,420.81/1,251.65
  6. Step 6: Final answer
    x = 643.49

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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.