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Finding the Fourth Proportional to 876.85, 1,209.91 and 503.77

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Solution

The fourth proportional to 876.85, 1,209.91 and 503.77 is: 695.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.85 : 1,209.91 = 503.77 : x
  2. Step 2: Convert to fraction form
    876.85/1,209.91 = 503.77/x
  3. Step 3: Cross multiply
    876.85x = 1,209.91 × 503.77
  4. Step 4: Simplify right side
    876.85x = 609,513.84
  5. Step 5: Solve for x
    x = 609,513.84/876.85
  6. Step 6: Final answer
    x = 695.12

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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.