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Finding the Fourth Proportional to 103,678.60, 155,681.93 and 78,746.80

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Solution

The fourth proportional to 103,678.60, 155,681.93 and 78,746.80 is: 118,244.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,678.60 : 155,681.93 = 78,746.80 : x
  2. Step 2: Convert to fraction form
    103,678.60/155,681.93 = 78,746.80/x
  3. Step 3: Cross multiply
    103,678.60x = 155,681.93 × 78,746.80
  4. Step 4: Simplify right side
    103,678.60x = 12,259,453,805.32
  5. Step 5: Solve for x
    x = 12,259,453,805.32/103,678.60
  6. Step 6: Final answer
    x = 118,244.79

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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.