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Finding the Fourth Proportional to 15,758.65, 21,746.40 and 8,685.07

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Solution

The fourth proportional to 15,758.65, 21,746.40 and 8,685.07 is: 11,985.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,758.65 : 21,746.40 = 8,685.07 : x
  2. Step 2: Convert to fraction form
    15,758.65/21,746.40 = 8,685.07/x
  3. Step 3: Cross multiply
    15,758.65x = 21,746.40 × 8,685.07
  4. Step 4: Simplify right side
    15,758.65x = 188,869,006.25
  5. Step 5: Solve for x
    x = 188,869,006.25/15,758.65
  6. Step 6: Final answer
    x = 11,985.10

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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.