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Finding the Fourth Proportional to 1,316.40, 1,815.97 and 784.91

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Solution

The fourth proportional to 1,316.40, 1,815.97 and 784.91 is: 1,082.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.40 : 1,815.97 = 784.91 : x
  2. Step 2: Convert to fraction form
    1,316.40/1,815.97 = 784.91/x
  3. Step 3: Cross multiply
    1,316.40x = 1,815.97 × 784.91
  4. Step 4: Simplify right side
    1,316.40x = 1,425,364.91
  5. Step 5: Solve for x
    x = 1,425,364.91/1,316.40
  6. Step 6: Final answer
    x = 1,082.78

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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.