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Finding the Fourth Proportional to 669.64, 1,009.47 and 625.04

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Solution

The fourth proportional to 669.64, 1,009.47 and 625.04 is: 942.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.64 : 1,009.47 = 625.04 : x
  2. Step 2: Convert to fraction form
    669.64/1,009.47 = 625.04/x
  3. Step 3: Cross multiply
    669.64x = 1,009.47 × 625.04
  4. Step 4: Simplify right side
    669.64x = 630,959.13
  5. Step 5: Solve for x
    x = 630,959.13/669.64
  6. Step 6: Final answer
    x = 942.24

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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.