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Finding the Fourth Proportional to 86,897, 130,056.20 and 65,720.36

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Solution

The fourth proportional to 86,897, 130,056.20 and 65,720.36 is: 98,361.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,897 : 130,056.20 = 65,720.36 : x
  2. Step 2: Convert to fraction form
    86,897/130,056.20 = 65,720.36/x
  3. Step 3: Cross multiply
    86,897x = 130,056.20 × 65,720.36
  4. Step 4: Simplify right side
    86,897x = 8,547,339,955.63
  5. Step 5: Solve for x
    x = 8,547,339,955.63/86,897
  6. Step 6: Final answer
    x = 98,361.74

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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.