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Finding the Fourth Proportional to 78,835.20, 118,252.80 and 77,798.40

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Solution

The fourth proportional to 78,835.20, 118,252.80 and 77,798.40 is: 116,697.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,835.20 : 118,252.80 = 77,798.40 : x
  2. Step 2: Convert to fraction form
    78,835.20/118,252.80 = 77,798.40/x
  3. Step 3: Cross multiply
    78,835.20x = 118,252.80 × 77,798.40
  4. Step 4: Simplify right side
    78,835.20x = 9,199,878,635.52
  5. Step 5: Solve for x
    x = 9,199,878,635.52/78,835.20
  6. Step 6: Final answer
    x = 116,697.60

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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.