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Finding the Fourth Proportional to 70,859.84, 97,760.90 and 40,215.20

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Solution

The fourth proportional to 70,859.84, 97,760.90 and 40,215.20 is: 55,482.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    70,859.84 : 97,760.90 = 40,215.20 : x
  2. Step 2: Convert to fraction form
    70,859.84/97,760.90 = 40,215.20/x
  3. Step 3: Cross multiply
    70,859.84x = 97,760.90 × 40,215.20
  4. Step 4: Simplify right side
    70,859.84x = 3,931,474,145.68
  5. Step 5: Solve for x
    x = 3,931,474,145.68/70,859.84
  6. Step 6: Final answer
    x = 55,482.40

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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.