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Finding the Fourth Proportional to 873.74, 1,205.79 and 500.79

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Solution

The fourth proportional to 873.74, 1,205.79 and 500.79 is: 691.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    873.74 : 1,205.79 = 500.79 : x
  2. Step 2: Convert to fraction form
    873.74/1,205.79 = 500.79/x
  3. Step 3: Cross multiply
    873.74x = 1,205.79 × 500.79
  4. Step 4: Simplify right side
    873.74x = 603,851.38
  5. Step 5: Solve for x
    x = 603,851.38/873.74
  6. Step 6: Final answer
    x = 691.11

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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.