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Finding the Fourth Proportional to 78,430.76, 117,669.22 and 28,510.07

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Solution

The fourth proportional to 78,430.76, 117,669.22 and 28,510.07 is: 42,773.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,430.76 : 117,669.22 = 28,510.07 : x
  2. Step 2: Convert to fraction form
    78,430.76/117,669.22 = 28,510.07/x
  3. Step 3: Cross multiply
    78,430.76x = 117,669.22 × 28,510.07
  4. Step 4: Simplify right side
    78,430.76x = 3,354,757,039.42
  5. Step 5: Solve for x
    x = 3,354,757,039.42/78,430.76
  6. Step 6: Final answer
    x = 42,773.49

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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.