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Finding the Fourth Proportional to 875.16, 1,315.14 and 842.76

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Solution

The fourth proportional to 875.16, 1,315.14 and 842.76 is: 1,266.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    875.16 : 1,315.14 = 842.76 : x
  2. Step 2: Convert to fraction form
    875.16/1,315.14 = 842.76/x
  3. Step 3: Cross multiply
    875.16x = 1,315.14 × 842.76
  4. Step 4: Simplify right side
    875.16x = 1,108,347.39
  5. Step 5: Solve for x
    x = 1,108,347.39/875.16
  6. Step 6: Final answer
    x = 1,266.45

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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.