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Finding the Fourth Proportional to 876.90, 1,210.10 and 483.91

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Solution

The fourth proportional to 876.90, 1,210.10 and 483.91 is: 667.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.90 : 1,210.10 = 483.91 : x
  2. Step 2: Convert to fraction form
    876.90/1,210.10 = 483.91/x
  3. Step 3: Cross multiply
    876.90x = 1,210.10 × 483.91
  4. Step 4: Simplify right side
    876.90x = 585,580.40
  5. Step 5: Solve for x
    x = 585,580.40/876.90
  6. Step 6: Final answer
    x = 667.79

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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.