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Finding the Fourth Proportional to 970.20, 1,338.39 and 615.51

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Solution

The fourth proportional to 970.20, 1,338.39 and 615.51 is: 849.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.20 : 1,338.39 = 615.51 : x
  2. Step 2: Convert to fraction form
    970.20/1,338.39 = 615.51/x
  3. Step 3: Cross multiply
    970.20x = 1,338.39 × 615.51
  4. Step 4: Simplify right side
    970.20x = 823,792.43
  5. Step 5: Solve for x
    x = 823,792.43/970.20
  6. Step 6: Final answer
    x = 849.10

Related Problems

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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.