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Finding the Fourth Proportional to 86,717.61, 130,074.59 and 39,970.49

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Solution

The fourth proportional to 86,717.61, 130,074.59 and 39,970.49 is: 59,954.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,717.61 : 130,074.59 = 39,970.49 : x
  2. Step 2: Convert to fraction form
    86,717.61/130,074.59 = 39,970.49/x
  3. Step 3: Cross multiply
    86,717.61x = 130,074.59 × 39,970.49
  4. Step 4: Simplify right side
    86,717.61x = 5,199,144,548.40
  5. Step 5: Solve for x
    x = 5,199,144,548.40/86,717.61
  6. Step 6: Final answer
    x = 59,954.89

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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.