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Finding the Fourth Proportional to 78,828.80, 118,048.80 and 52,390.40

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Solution

The fourth proportional to 78,828.80, 118,048.80 and 52,390.40 is: 78,456.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,828.80 : 118,048.80 = 52,390.40 : x
  2. Step 2: Convert to fraction form
    78,828.80/118,048.80 = 52,390.40/x
  3. Step 3: Cross multiply
    78,828.80x = 118,048.80 × 52,390.40
  4. Step 4: Simplify right side
    78,828.80x = 6,184,623,851.52
  5. Step 5: Solve for x
    x = 6,184,623,851.52/78,828.80
  6. Step 6: Final answer
    x = 78,456.40

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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.