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Finding the Fourth Proportional to 1,011.19, 1,394.02 and 715.94

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Solution

The fourth proportional to 1,011.19, 1,394.02 and 715.94 is: 986.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,011.19 : 1,394.02 = 715.94 : x
  2. Step 2: Convert to fraction form
    1,011.19/1,394.02 = 715.94/x
  3. Step 3: Cross multiply
    1,011.19x = 1,394.02 × 715.94
  4. Step 4: Simplify right side
    1,011.19x = 998,034.68
  5. Step 5: Solve for x
    x = 998,034.68/1,011.19
  6. Step 6: Final answer
    x = 986.99

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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.