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Finding the Fourth Proportional to 85,527.30, 128,145.15 and 70,655.70

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Solution

The fourth proportional to 85,527.30, 128,145.15 and 70,655.70 is: 105,863.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,527.30 : 128,145.15 = 70,655.70 : x
  2. Step 2: Convert to fraction form
    85,527.30/128,145.15 = 70,655.70/x
  3. Step 3: Cross multiply
    85,527.30x = 128,145.15 × 70,655.70
  4. Step 4: Simplify right side
    85,527.30x = 9,054,185,274.86
  5. Step 5: Solve for x
    x = 9,054,185,274.86/85,527.30
  6. Step 6: Final answer
    x = 105,863.10

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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.