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Finding the Fourth Proportional to 72,681.40, 109,047.70 and 70,121.40

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Solution

The fourth proportional to 72,681.40, 109,047.70 and 70,121.40 is: 105,206.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,681.40 : 109,047.70 = 70,121.40 : x
  2. Step 2: Convert to fraction form
    72,681.40/109,047.70 = 70,121.40/x
  3. Step 3: Cross multiply
    72,681.40x = 109,047.70 × 70,121.40
  4. Step 4: Simplify right side
    72,681.40x = 7,646,577,390.78
  5. Step 5: Solve for x
    x = 7,646,577,390.78/72,681.40
  6. Step 6: Final answer
    x = 105,206.80

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1.5x scale

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.