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Finding the Fourth Proportional to 66,130.81, 91,271.74 and 39,287.81

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Solution

The fourth proportional to 66,130.81, 91,271.74 and 39,287.81 is: 54,223.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,130.81 : 91,271.74 = 39,287.81 : x
  2. Step 2: Convert to fraction form
    66,130.81/91,271.74 = 39,287.81/x
  3. Step 3: Cross multiply
    66,130.81x = 91,271.74 × 39,287.81
  4. Step 4: Simplify right side
    66,130.81x = 3,585,866,779.49
  5. Step 5: Solve for x
    x = 3,585,866,779.49/66,130.81
  6. Step 6: Final answer
    x = 54,223.84

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.