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Finding the Fourth Proportional to 1,129.55, 1,558.76 and 657.72

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Solution

The fourth proportional to 1,129.55, 1,558.76 and 657.72 is: 907.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.55 : 1,558.76 = 657.72 : x
  2. Step 2: Convert to fraction form
    1,129.55/1,558.76 = 657.72/x
  3. Step 3: Cross multiply
    1,129.55x = 1,558.76 × 657.72
  4. Step 4: Simplify right side
    1,129.55x = 1,025,230.18
  5. Step 5: Solve for x
    x = 1,025,230.18/1,129.55
  6. Step 6: Final answer
    x = 907.65

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Half scale
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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.