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Finding the Fourth Proportional to 765.32, 1,056.44 and 647.90

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Solution

The fourth proportional to 765.32, 1,056.44 and 647.90 is: 894.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.32 : 1,056.44 = 647.90 : x
  2. Step 2: Convert to fraction form
    765.32/1,056.44 = 647.90/x
  3. Step 3: Cross multiply
    765.32x = 1,056.44 × 647.90
  4. Step 4: Simplify right side
    765.32x = 684,467.78
  5. Step 5: Solve for x
    x = 684,467.78/765.32
  6. Step 6: Final answer
    x = 894.36

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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.