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Finding the Fourth Proportional to 72,912.80, 109,484.40 and 53,328.80

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Solution

The fourth proportional to 72,912.80, 109,484.40 and 53,328.80 is: 80,077.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,912.80 : 109,484.40 = 53,328.80 : x
  2. Step 2: Convert to fraction form
    72,912.80/109,484.40 = 53,328.80/x
  3. Step 3: Cross multiply
    72,912.80x = 109,484.40 × 53,328.80
  4. Step 4: Simplify right side
    72,912.80x = 5,838,671,670.72
  5. Step 5: Solve for x
    x = 5,838,671,670.72/72,912.80
  6. Step 6: Final answer
    x = 80,077.46

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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.