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Finding the Fourth Proportional to 78,495.30, 108,325.56 and 42,687.40

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Solution

The fourth proportional to 78,495.30, 108,325.56 and 42,687.40 is: 58,909.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,495.30 : 108,325.56 = 42,687.40 : x
  2. Step 2: Convert to fraction form
    78,495.30/108,325.56 = 42,687.40/x
  3. Step 3: Cross multiply
    78,495.30x = 108,325.56 × 42,687.40
  4. Step 4: Simplify right side
    78,495.30x = 4,624,136,509.94
  5. Step 5: Solve for x
    x = 4,624,136,509.94/78,495.30
  6. Step 6: Final answer
    x = 58,909.72

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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.