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Finding the Fourth Proportional to 1,685.90, 2,528.61 and 531.50

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Solution

The fourth proportional to 1,685.90, 2,528.61 and 531.50 is: 797.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,685.90 : 2,528.61 = 531.50 : x
  2. Step 2: Convert to fraction form
    1,685.90/2,528.61 = 531.50/x
  3. Step 3: Cross multiply
    1,685.90x = 2,528.61 × 531.50
  4. Step 4: Simplify right side
    1,685.90x = 1,343,956.22
  5. Step 5: Solve for x
    x = 1,343,956.22/1,685.90
  6. Step 6: Final answer
    x = 797.17

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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.