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Finding the Fourth Proportional to 1,346.79, 1,858.17 and 815.87

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Solution

The fourth proportional to 1,346.79, 1,858.17 and 815.87 is: 1,125.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,346.79 : 1,858.17 = 815.87 : x
  2. Step 2: Convert to fraction form
    1,346.79/1,858.17 = 815.87/x
  3. Step 3: Cross multiply
    1,346.79x = 1,858.17 × 815.87
  4. Step 4: Simplify right side
    1,346.79x = 1,516,032.86
  5. Step 5: Solve for x
    x = 1,516,032.86/1,346.79
  6. Step 6: Final answer
    x = 1,125.66

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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.