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Finding the Fourth Proportional to 643.37, 887.45 and 560.67

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Solution

The fourth proportional to 643.37, 887.45 and 560.67 is: 773.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    643.37 : 887.45 = 560.67 : x
  2. Step 2: Convert to fraction form
    643.37/887.45 = 560.67/x
  3. Step 3: Cross multiply
    643.37x = 887.45 × 560.67
  4. Step 4: Simplify right side
    643.37x = 497,565.19
  5. Step 5: Solve for x
    x = 497,565.19/643.37
  6. Step 6: Final answer
    x = 773.38

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Double scale
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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.