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Finding the Fourth Proportional to 763.77, 1,053.21 and 653.61

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Solution

The fourth proportional to 763.77, 1,053.21 and 653.61 is: 901.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    763.77 : 1,053.21 = 653.61 : x
  2. Step 2: Convert to fraction form
    763.77/1,053.21 = 653.61/x
  3. Step 3: Cross multiply
    763.77x = 1,053.21 × 653.61
  4. Step 4: Simplify right side
    763.77x = 688,383.32
  5. Step 5: Solve for x
    x = 688,383.32/763.77
  6. Step 6: Final answer
    x = 901.30

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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.