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Finding the Fourth Proportional to 85,438.80, 128,012.40 and 70,567.20

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Solution

The fourth proportional to 85,438.80, 128,012.40 and 70,567.20 is: 105,730.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,438.80 : 128,012.40 = 70,567.20 : x
  2. Step 2: Convert to fraction form
    85,438.80/128,012.40 = 70,567.20/x
  3. Step 3: Cross multiply
    85,438.80x = 128,012.40 × 70,567.20
  4. Step 4: Simplify right side
    85,438.80x = 9,033,476,633.28
  5. Step 5: Solve for x
    x = 9,033,476,633.28/85,438.80
  6. Step 6: Final answer
    x = 105,730.38

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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.