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Finding the Fourth Proportional to 1,140.38, 1,575.40 and 860.63

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Solution

The fourth proportional to 1,140.38, 1,575.40 and 860.63 is: 1,188.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.38 : 1,575.40 = 860.63 : x
  2. Step 2: Convert to fraction form
    1,140.38/1,575.40 = 860.63/x
  3. Step 3: Cross multiply
    1,140.38x = 1,575.40 × 860.63
  4. Step 4: Simplify right side
    1,140.38x = 1,355,828.09
  5. Step 5: Solve for x
    x = 1,355,828.09/1,140.38
  6. Step 6: Final answer
    x = 1,188.93

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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.