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Finding the Fourth Proportional to 72,692.40, 109,038.60 and 61,287.60

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Solution

The fourth proportional to 72,692.40, 109,038.60 and 61,287.60 is: 91,931.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,692.40 : 109,038.60 = 61,287.60 : x
  2. Step 2: Convert to fraction form
    72,692.40/109,038.60 = 61,287.60/x
  3. Step 3: Cross multiply
    72,692.40x = 109,038.60 × 61,287.60
  4. Step 4: Simplify right side
    72,692.40x = 6,682,714,101.36
  5. Step 5: Solve for x
    x = 6,682,714,101.36/72,692.40
  6. Step 6: Final answer
    x = 91,931.40

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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.