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Finding the Fourth Proportional to 1,658.40, 2,288.65 and 912.39

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Solution

The fourth proportional to 1,658.40, 2,288.65 and 912.39 is: 1,259.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,658.40 : 2,288.65 = 912.39 : x
  2. Step 2: Convert to fraction form
    1,658.40/2,288.65 = 912.39/x
  3. Step 3: Cross multiply
    1,658.40x = 2,288.65 × 912.39
  4. Step 4: Simplify right side
    1,658.40x = 2,088,141.37
  5. Step 5: Solve for x
    x = 2,088,141.37/1,658.40
  6. Step 6: Final answer
    x = 1,259.13

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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.