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Finding the Fourth Proportional to 90,699, 125,155.95 and 84,011.64

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Solution

The fourth proportional to 90,699, 125,155.95 and 84,011.64 is: 115,928.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,699 : 125,155.95 = 84,011.64 : x
  2. Step 2: Convert to fraction form
    90,699/125,155.95 = 84,011.64/x
  3. Step 3: Cross multiply
    90,699x = 125,155.95 × 84,011.64
  4. Step 4: Simplify right side
    90,699x = 10,514,556,615.26
  5. Step 5: Solve for x
    x = 10,514,556,615.26/90,699
  6. Step 6: Final answer
    x = 115,928.03

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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.