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Finding the Fourth Proportional to 1,117.86, 1,666.92 and 964.77

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Solution

The fourth proportional to 1,117.86, 1,666.92 and 964.77 is: 1,438.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.86 : 1,666.92 = 964.77 : x
  2. Step 2: Convert to fraction form
    1,117.86/1,666.92 = 964.77/x
  3. Step 3: Cross multiply
    1,117.86x = 1,666.92 × 964.77
  4. Step 4: Simplify right side
    1,117.86x = 1,608,194.41
  5. Step 5: Solve for x
    x = 1,608,194.41/1,117.86
  6. Step 6: Final answer
    x = 1,438.64

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.