Home / 31,005.36-42,715.08-21,557.52

Finding the Fourth Proportional to 31,005.36, 42,715.08 and 21,557.52

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Solution

The fourth proportional to 31,005.36, 42,715.08 and 21,557.52 is: 29,699.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,005.36 : 42,715.08 = 21,557.52 : x
  2. Step 2: Convert to fraction form
    31,005.36/42,715.08 = 21,557.52/x
  3. Step 3: Cross multiply
    31,005.36x = 42,715.08 × 21,557.52
  4. Step 4: Simplify right side
    31,005.36x = 920,831,191.40
  5. Step 5: Solve for x
    x = 920,831,191.40/31,005.36
  6. Step 6: Final answer
    x = 29,699.10

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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.