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Finding the Fourth Proportional to 810.13, 1,117.90 and 495.24

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Solution

The fourth proportional to 810.13, 1,117.90 and 495.24 is: 683.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    810.13 : 1,117.90 = 495.24 : x
  2. Step 2: Convert to fraction form
    810.13/1,117.90 = 495.24/x
  3. Step 3: Cross multiply
    810.13x = 1,117.90 × 495.24
  4. Step 4: Simplify right side
    810.13x = 553,628.80
  5. Step 5: Solve for x
    x = 553,628.80/810.13
  6. Step 6: Final answer
    x = 683.38

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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.