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Finding the Fourth Proportional to 1,587.76, 2,390.26 and 1,429

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Solution

The fourth proportional to 1,587.76, 2,390.26 and 1,429 is: 2,151.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,587.76 : 2,390.26 = 1,429 : x
  2. Step 2: Convert to fraction form
    1,587.76/2,390.26 = 1,429/x
  3. Step 3: Cross multiply
    1,587.76x = 2,390.26 × 1,429
  4. Step 4: Simplify right side
    1,587.76x = 3,415,681.54
  5. Step 5: Solve for x
    x = 3,415,681.54/1,587.76
  6. Step 6: Final answer
    x = 2,151.26

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.