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Finding the Fourth Proportional to 810.60, 1,117.11 and 558.60

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Solution

The fourth proportional to 810.60, 1,117.11 and 558.60 is: 769.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.60 : 1,117.11 = 558.60 : x
  2. Step 2: Convert to fraction form
    810.60/1,117.11 = 558.60/x
  3. Step 3: Cross multiply
    810.60x = 1,117.11 × 558.60
  4. Step 4: Simplify right side
    810.60x = 624,017.65
  5. Step 5: Solve for x
    x = 624,017.65/810.60
  6. Step 6: Final answer
    x = 769.82

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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.