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Finding the Fourth Proportional to 1,663.70, 2,495.20 and 841.20

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Solution

The fourth proportional to 1,663.70, 2,495.20 and 841.20 is: 1,261.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,663.70 : 2,495.20 = 841.20 : x
  2. Step 2: Convert to fraction form
    1,663.70/2,495.20 = 841.20/x
  3. Step 3: Cross multiply
    1,663.70x = 2,495.20 × 841.20
  4. Step 4: Simplify right side
    1,663.70x = 2,098,962.24
  5. Step 5: Solve for x
    x = 2,098,962.24/1,663.70
  6. Step 6: Final answer
    x = 1,261.62

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1.5x scale

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.