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Finding the Fourth Proportional to 1,561.68, 2,154.99 and 972.10

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Solution

The fourth proportional to 1,561.68, 2,154.99 and 972.10 is: 1,341.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,561.68 : 2,154.99 = 972.10 : x
  2. Step 2: Convert to fraction form
    1,561.68/2,154.99 = 972.10/x
  3. Step 3: Cross multiply
    1,561.68x = 2,154.99 × 972.10
  4. Step 4: Simplify right side
    1,561.68x = 2,094,865.78
  5. Step 5: Solve for x
    x = 2,094,865.78/1,561.68
  6. Step 6: Final answer
    x = 1,341.42

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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.