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Finding the Fourth Proportional to 887.49, 1,325.53 and 643.28

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Solution

The fourth proportional to 887.49, 1,325.53 and 643.28 is: 960.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    887.49 : 1,325.53 = 643.28 : x
  2. Step 2: Convert to fraction form
    887.49/1,325.53 = 643.28/x
  3. Step 3: Cross multiply
    887.49x = 1,325.53 × 643.28
  4. Step 4: Simplify right side
    887.49x = 852,681.11
  5. Step 5: Solve for x
    x = 852,681.11/887.49
  6. Step 6: Final answer
    x = 960.78

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.