Home / 1,680.31-2,318.99-972.18

Finding the Fourth Proportional to 1,680.31, 2,318.99 and 972.18

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Solution

The fourth proportional to 1,680.31, 2,318.99 and 972.18 is: 1,341.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,680.31 : 2,318.99 = 972.18 : x
  2. Step 2: Convert to fraction form
    1,680.31/2,318.99 = 972.18/x
  3. Step 3: Cross multiply
    1,680.31x = 2,318.99 × 972.18
  4. Step 4: Simplify right side
    1,680.31x = 2,254,475.70
  5. Step 5: Solve for x
    x = 2,254,475.70/1,680.31
  6. Step 6: Final answer
    x = 1,341.70

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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.