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Finding the Fourth Proportional to 78,688.53, 108,630.32 and 53,328.92

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Solution

The fourth proportional to 78,688.53, 108,630.32 and 53,328.92 is: 73,621.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,688.53 : 108,630.32 = 53,328.92 : x
  2. Step 2: Convert to fraction form
    78,688.53/108,630.32 = 53,328.92/x
  3. Step 3: Cross multiply
    78,688.53x = 108,630.32 × 53,328.92
  4. Step 4: Simplify right side
    78,688.53x = 5,793,136,835.06
  5. Step 5: Solve for x
    x = 5,793,136,835.06/78,688.53
  6. Step 6: Final answer
    x = 73,621.11

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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.