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Finding the Fourth Proportional to 78,490.79, 108,602.53 and 68,440.18

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Solution

The fourth proportional to 78,490.79, 108,602.53 and 68,440.18 is: 94,696.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,490.79 : 108,602.53 = 68,440.18 : x
  2. Step 2: Convert to fraction form
    78,490.79/108,602.53 = 68,440.18/x
  3. Step 3: Cross multiply
    78,490.79x = 108,602.53 × 68,440.18
  4. Step 4: Simplify right side
    78,490.79x = 7,432,776,259.05
  5. Step 5: Solve for x
    x = 7,432,776,259.05/78,490.79
  6. Step 6: Final answer
    x = 94,696.16

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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.