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Finding the Fourth Proportional to 13,642.47, 18,825.95 and 7,674.71

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Solution

The fourth proportional to 13,642.47, 18,825.95 and 7,674.71 is: 10,590.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,642.47 : 18,825.95 = 7,674.71 : x
  2. Step 2: Convert to fraction form
    13,642.47/18,825.95 = 7,674.71/x
  3. Step 3: Cross multiply
    13,642.47x = 18,825.95 × 7,674.71
  4. Step 4: Simplify right side
    13,642.47x = 144,483,574.22
  5. Step 5: Solve for x
    x = 144,483,574.22/13,642.47
  6. Step 6: Final answer
    x = 10,590.72

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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.