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Finding the Fourth Proportional to 86,575.40, 129,863.10 and 47,209.40

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Solution

The fourth proportional to 86,575.40, 129,863.10 and 47,209.40 is: 70,814.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,575.40 : 129,863.10 = 47,209.40 : x
  2. Step 2: Convert to fraction form
    86,575.40/129,863.10 = 47,209.40/x
  3. Step 3: Cross multiply
    86,575.40x = 129,863.10 × 47,209.40
  4. Step 4: Simplify right side
    86,575.40x = 6,130,759,033.14
  5. Step 5: Solve for x
    x = 6,130,759,033.14/86,575.40
  6. Step 6: Final answer
    x = 70,814.10

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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.