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Finding the Fourth Proportional to 602.80, 831.18 and 491.93

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Solution

The fourth proportional to 602.80, 831.18 and 491.93 is: 678.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    602.80 : 831.18 = 491.93 : x
  2. Step 2: Convert to fraction form
    602.80/831.18 = 491.93/x
  3. Step 3: Cross multiply
    602.80x = 831.18 × 491.93
  4. Step 4: Simplify right side
    602.80x = 408,882.38
  5. Step 5: Solve for x
    x = 408,882.38/602.80
  6. Step 6: Final answer
    x = 678.31

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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.