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Finding the Fourth Proportional to 72,698.40, 100,316.88 and 42,490.80

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Solution

The fourth proportional to 72,698.40, 100,316.88 and 42,490.80 is: 58,633.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,698.40 : 100,316.88 = 42,490.80 : x
  2. Step 2: Convert to fraction form
    72,698.40/100,316.88 = 42,490.80/x
  3. Step 3: Cross multiply
    72,698.40x = 100,316.88 × 42,490.80
  4. Step 4: Simplify right side
    72,698.40x = 4,262,544,484.70
  5. Step 5: Solve for x
    x = 4,262,544,484.70/72,698.40
  6. Step 6: Final answer
    x = 58,633.26

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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.