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Finding the Fourth Proportional to 938.04, 1,295.12 and 643.20

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Solution

The fourth proportional to 938.04, 1,295.12 and 643.20 is: 888.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.04 : 1,295.12 = 643.20 : x
  2. Step 2: Convert to fraction form
    938.04/1,295.12 = 643.20/x
  3. Step 3: Cross multiply
    938.04x = 1,295.12 × 643.20
  4. Step 4: Simplify right side
    938.04x = 833,021.18
  5. Step 5: Solve for x
    x = 833,021.18/938.04
  6. Step 6: Final answer
    x = 888.04

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1.5x scale

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.