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Finding the Fourth Proportional to 86,776.40, 130,018.80 and 42,307.40

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Solution

The fourth proportional to 86,776.40, 130,018.80 and 42,307.40 is: 63,390.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,776.40 : 130,018.80 = 42,307.40 : x
  2. Step 2: Convert to fraction form
    86,776.40/130,018.80 = 42,307.40/x
  3. Step 3: Cross multiply
    86,776.40x = 130,018.80 × 42,307.40
  4. Step 4: Simplify right side
    86,776.40x = 5,500,757,379.12
  5. Step 5: Solve for x
    x = 5,500,757,379.12/86,776.40
  6. Step 6: Final answer
    x = 63,390.02

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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.