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Finding the Fourth Proportional to 875.48, 1,313.62 and 860.90

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Solution

The fourth proportional to 875.48, 1,313.62 and 860.90 is: 1,291.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.48 : 1,313.62 = 860.90 : x
  2. Step 2: Convert to fraction form
    875.48/1,313.62 = 860.90/x
  3. Step 3: Cross multiply
    875.48x = 1,313.62 × 860.90
  4. Step 4: Simplify right side
    875.48x = 1,130,886.74
  5. Step 5: Solve for x
    x = 1,130,886.74/875.48
  6. Step 6: Final answer
    x = 1,291.74

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.