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Finding the Fourth Proportional to 661.35, 992.37 and 430.18

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Solution

The fourth proportional to 661.35, 992.37 and 430.18 is: 645.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    661.35 : 992.37 = 430.18 : x
  2. Step 2: Convert to fraction form
    661.35/992.37 = 430.18/x
  3. Step 3: Cross multiply
    661.35x = 992.37 × 430.18
  4. Step 4: Simplify right side
    661.35x = 426,897.73
  5. Step 5: Solve for x
    x = 426,897.73/661.35
  6. Step 6: Final answer
    x = 645.49

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.