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Finding the Fourth Proportional to 775.68, 1,068.12 and 665.08

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Solution

The fourth proportional to 775.68, 1,068.12 and 665.08 is: 915.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    775.68 : 1,068.12 = 665.08 : x
  2. Step 2: Convert to fraction form
    775.68/1,068.12 = 665.08/x
  3. Step 3: Cross multiply
    775.68x = 1,068.12 × 665.08
  4. Step 4: Simplify right side
    775.68x = 710,385.25
  5. Step 5: Solve for x
    x = 710,385.25/775.68
  6. Step 6: Final answer
    x = 915.82

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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.