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Finding the Fourth Proportional to 98,980.80, 148,490.40 and 42,820.80

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Solution

The fourth proportional to 98,980.80, 148,490.40 and 42,820.80 is: 64,239.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    98,980.80 : 148,490.40 = 42,820.80 : x
  2. Step 2: Convert to fraction form
    98,980.80/148,490.40 = 42,820.80/x
  3. Step 3: Cross multiply
    98,980.80x = 148,490.40 × 42,820.80
  4. Step 4: Simplify right side
    98,980.80x = 6,358,477,720.32
  5. Step 5: Solve for x
    x = 6,358,477,720.32/98,980.80
  6. Step 6: Final answer
    x = 64,239.51

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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.