Home / 85,991.16-128,995.38-31,970.28

Finding the Fourth Proportional to 85,991.16, 128,995.38 and 31,970.28

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Solution

The fourth proportional to 85,991.16, 128,995.38 and 31,970.28 is: 47,958.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,991.16 : 128,995.38 = 31,970.28 : x
  2. Step 2: Convert to fraction form
    85,991.16/128,995.38 = 31,970.28/x
  3. Step 3: Cross multiply
    85,991.16x = 128,995.38 × 31,970.28
  4. Step 4: Simplify right side
    85,991.16x = 4,124,018,417.31
  5. Step 5: Solve for x
    x = 4,124,018,417.31/85,991.16
  6. Step 6: Final answer
    x = 47,958.63

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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.