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Finding the Fourth Proportional to 876.30, 1,210.59 and 646.26

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Solution

The fourth proportional to 876.30, 1,210.59 and 646.26 is: 892.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    876.30 : 1,210.59 = 646.26 : x
  2. Step 2: Convert to fraction form
    876.30/1,210.59 = 646.26/x
  3. Step 3: Cross multiply
    876.30x = 1,210.59 × 646.26
  4. Step 4: Simplify right side
    876.30x = 782,355.89
  5. Step 5: Solve for x
    x = 782,355.89/876.30
  6. Step 6: Final answer
    x = 892.79

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Double scale
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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.