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Finding the Fourth Proportional to 85,406.40, 128,128.80 and 26,244.80

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Solution

The fourth proportional to 85,406.40, 128,128.80 and 26,244.80 is: 39,373.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,406.40 : 128,128.80 = 26,244.80 : x
  2. Step 2: Convert to fraction form
    85,406.40/128,128.80 = 26,244.80/x
  3. Step 3: Cross multiply
    85,406.40x = 128,128.80 × 26,244.80
  4. Step 4: Simplify right side
    85,406.40x = 3,362,714,730.24
  5. Step 5: Solve for x
    x = 3,362,714,730.24/85,406.40
  6. Step 6: Final answer
    x = 39,373.10

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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.