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Finding the Fourth Proportional to 77,312.20, 115,968.30 and 21,152.20

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Solution

The fourth proportional to 77,312.20, 115,968.30 and 21,152.20 is: 31,728.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,312.20 : 115,968.30 = 21,152.20 : x
  2. Step 2: Convert to fraction form
    77,312.20/115,968.30 = 21,152.20/x
  3. Step 3: Cross multiply
    77,312.20x = 115,968.30 × 21,152.20
  4. Step 4: Simplify right side
    77,312.20x = 2,452,984,675.26
  5. Step 5: Solve for x
    x = 2,452,984,675.26/77,312.20
  6. Step 6: Final answer
    x = 31,728.30

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1.5x scale

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.