Home / 86,020.10-129,030.15-81,427.40

Finding the Fourth Proportional to 86,020.10, 129,030.15 and 81,427.40

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Solution

The fourth proportional to 86,020.10, 129,030.15 and 81,427.40 is: 122,141.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,020.10 : 129,030.15 = 81,427.40 : x
  2. Step 2: Convert to fraction form
    86,020.10/129,030.15 = 81,427.40/x
  3. Step 3: Cross multiply
    86,020.10x = 129,030.15 × 81,427.40
  4. Step 4: Simplify right side
    86,020.10x = 10,506,589,636.11
  5. Step 5: Solve for x
    x = 10,506,589,636.11/86,020.10
  6. Step 6: Final answer
    x = 122,141.10

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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.