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Finding the Fourth Proportional to 1,007.48, 1,390.28 and 587.84

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Solution

The fourth proportional to 1,007.48, 1,390.28 and 587.84 is: 811.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,007.48 : 1,390.28 = 587.84 : x
  2. Step 2: Convert to fraction form
    1,007.48/1,390.28 = 587.84/x
  3. Step 3: Cross multiply
    1,007.48x = 1,390.28 × 587.84
  4. Step 4: Simplify right side
    1,007.48x = 817,262.20
  5. Step 5: Solve for x
    x = 817,262.20/1,007.48
  6. Step 6: Final answer
    x = 811.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.