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Finding the Fourth Proportional to 989.35, 1,366.45 and 657.20

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Solution

The fourth proportional to 989.35, 1,366.45 and 657.20 is: 907.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    989.35 : 1,366.45 = 657.20 : x
  2. Step 2: Convert to fraction form
    989.35/1,366.45 = 657.20/x
  3. Step 3: Cross multiply
    989.35x = 1,366.45 × 657.20
  4. Step 4: Simplify right side
    989.35x = 898,032.71
  5. Step 5: Solve for x
    x = 898,032.71/989.35
  6. Step 6: Final answer
    x = 907.70

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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.