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Finding the Fourth Proportional to 103,931.40, 143,421.84 and 65,711.52

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Solution

The fourth proportional to 103,931.40, 143,421.84 and 65,711.52 is: 90,679.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,931.40 : 143,421.84 = 65,711.52 : x
  2. Step 2: Convert to fraction form
    103,931.40/143,421.84 = 65,711.52/x
  3. Step 3: Cross multiply
    103,931.40x = 143,421.84 × 65,711.52
  4. Step 4: Simplify right side
    103,931.40x = 9,424,467,107.60
  5. Step 5: Solve for x
    x = 9,424,467,107.60/103,931.40
  6. Step 6: Final answer
    x = 90,679.69

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1.5x scale

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.