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Finding the Fourth Proportional to 1,417.53, 2,123.21 and 685.56

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Solution

The fourth proportional to 1,417.53, 2,123.21 and 685.56 is: 1,026.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,417.53 : 2,123.21 = 685.56 : x
  2. Step 2: Convert to fraction form
    1,417.53/2,123.21 = 685.56/x
  3. Step 3: Cross multiply
    1,417.53x = 2,123.21 × 685.56
  4. Step 4: Simplify right side
    1,417.53x = 1,455,587.85
  5. Step 5: Solve for x
    x = 1,455,587.85/1,417.53
  6. Step 6: Final answer
    x = 1,026.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.