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Finding the Fourth Proportional to 85,813.52, 128,720.40 and 35,866.28

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Solution

The fourth proportional to 85,813.52, 128,720.40 and 35,866.28 is: 53,799.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,813.52 : 128,720.40 = 35,866.28 : x
  2. Step 2: Convert to fraction form
    85,813.52/128,720.40 = 35,866.28/x
  3. Step 3: Cross multiply
    85,813.52x = 128,720.40 × 35,866.28
  4. Step 4: Simplify right side
    85,813.52x = 4,616,721,908.11
  5. Step 5: Solve for x
    x = 4,616,721,908.11/85,813.52
  6. Step 6: Final answer
    x = 53,799.47

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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.