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Finding the Fourth Proportional to 1,565.09, 2,159.79 and 856.91

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Solution

The fourth proportional to 1,565.09, 2,159.79 and 856.91 is: 1,182.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,565.09 : 2,159.79 = 856.91 : x
  2. Step 2: Convert to fraction form
    1,565.09/2,159.79 = 856.91/x
  3. Step 3: Cross multiply
    1,565.09x = 2,159.79 × 856.91
  4. Step 4: Simplify right side
    1,565.09x = 1,850,734.85
  5. Step 5: Solve for x
    x = 1,850,734.85/1,565.09
  6. Step 6: Final answer
    x = 1,182.51

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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.