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Finding the Fourth Proportional to 42,808.60, 64,212.90 and 13,223.80

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Solution

The fourth proportional to 42,808.60, 64,212.90 and 13,223.80 is: 19,835.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,808.60 : 64,212.90 = 13,223.80 : x
  2. Step 2: Convert to fraction form
    42,808.60/64,212.90 = 13,223.80/x
  3. Step 3: Cross multiply
    42,808.60x = 64,212.90 × 13,223.80
  4. Step 4: Simplify right side
    42,808.60x = 849,138,547.02
  5. Step 5: Solve for x
    x = 849,138,547.02/42,808.60
  6. Step 6: Final answer
    x = 19,835.70

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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.