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Finding the Fourth Proportional to 876.45, 1,209.51 and 483.51

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Solution

The fourth proportional to 876.45, 1,209.51 and 483.51 is: 667.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.45 : 1,209.51 = 483.51 : x
  2. Step 2: Convert to fraction form
    876.45/1,209.51 = 483.51/x
  3. Step 3: Cross multiply
    876.45x = 1,209.51 × 483.51
  4. Step 4: Simplify right side
    876.45x = 584,810.18
  5. Step 5: Solve for x
    x = 584,810.18/876.45
  6. Step 6: Final answer
    x = 667.25

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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.