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Finding the Fourth Proportional to 78,988.16, 108,986.10 and 45,454.16

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Solution

The fourth proportional to 78,988.16, 108,986.10 and 45,454.16 is: 62,716.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,988.16 : 108,986.10 = 45,454.16 : x
  2. Step 2: Convert to fraction form
    78,988.16/108,986.10 = 45,454.16/x
  3. Step 3: Cross multiply
    78,988.16x = 108,986.10 × 45,454.16
  4. Step 4: Simplify right side
    78,988.16x = 4,953,871,627.18
  5. Step 5: Solve for x
    x = 4,953,871,627.18/78,988.16
  6. Step 6: Final answer
    x = 62,716.64

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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.