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Finding the Fourth Proportional to 8,685.65, 11,985.63 and 5,541.50

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Solution

The fourth proportional to 8,685.65, 11,985.63 and 5,541.50 is: 7,646.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,685.65 : 11,985.63 = 5,541.50 : x
  2. Step 2: Convert to fraction form
    8,685.65/11,985.63 = 5,541.50/x
  3. Step 3: Cross multiply
    8,685.65x = 11,985.63 × 5,541.50
  4. Step 4: Simplify right side
    8,685.65x = 66,418,368.65
  5. Step 5: Solve for x
    x = 66,418,368.65/8,685.65
  6. Step 6: Final answer
    x = 7,646.91

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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.