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Finding the Fourth Proportional to 1,560.71, 2,153.77 and 931.65

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Solution

The fourth proportional to 1,560.71, 2,153.77 and 931.65 is: 1,285.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,560.71 : 2,153.77 = 931.65 : x
  2. Step 2: Convert to fraction form
    1,560.71/2,153.77 = 931.65/x
  3. Step 3: Cross multiply
    1,560.71x = 2,153.77 × 931.65
  4. Step 4: Simplify right side
    1,560.71x = 2,006,549.05
  5. Step 5: Solve for x
    x = 2,006,549.05/1,560.71
  6. Step 6: Final answer
    x = 1,285.66

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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.