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Finding the Fourth Proportional to 1,681.60, 2,522.70 and 707.80

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Solution

The fourth proportional to 1,681.60, 2,522.70 and 707.80 is: 1,061.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,681.60 : 2,522.70 = 707.80 : x
  2. Step 2: Convert to fraction form
    1,681.60/2,522.70 = 707.80/x
  3. Step 3: Cross multiply
    1,681.60x = 2,522.70 × 707.80
  4. Step 4: Simplify right side
    1,681.60x = 1,785,567.06
  5. Step 5: Solve for x
    x = 1,785,567.06/1,681.60
  6. Step 6: Final answer
    x = 1,061.83

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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.