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Finding the Fourth Proportional to 130,987, 180,762.06 and 71,371

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Solution

The fourth proportional to 130,987, 180,762.06 and 71,371 is: 98,491.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    130,987 : 180,762.06 = 71,371 : x
  2. Step 2: Convert to fraction form
    130,987/180,762.06 = 71,371/x
  3. Step 3: Cross multiply
    130,987x = 180,762.06 × 71,371
  4. Step 4: Simplify right side
    130,987x = 12,901,168,984.26
  5. Step 5: Solve for x
    x = 12,901,168,984.26/130,987
  6. Step 6: Final answer
    x = 98,491.98

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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.