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Finding the Fourth Proportional to 279,043.80, 418,565.70 and 139,075.80

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Solution

The fourth proportional to 279,043.80, 418,565.70 and 139,075.80 is: 208,613.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,043.80 : 418,565.70 = 139,075.80 : x
  2. Step 2: Convert to fraction form
    279,043.80/418,565.70 = 139,075.80/x
  3. Step 3: Cross multiply
    279,043.80x = 418,565.70 × 139,075.80
  4. Step 4: Simplify right side
    279,043.80x = 58,212,359,580.06
  5. Step 5: Solve for x
    x = 58,212,359,580.06/279,043.80
  6. Step 6: Final answer
    x = 208,613.70

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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.