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Finding the Fourth Proportional to 420,011.40, 579,565.62 and 238,657.80

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Solution

The fourth proportional to 420,011.40, 579,565.62 and 238,657.80 is: 329,319.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    420,011.40 : 579,565.62 = 238,657.80 : x
  2. Step 2: Convert to fraction form
    420,011.40/579,565.62 = 238,657.80/x
  3. Step 3: Cross multiply
    420,011.40x = 579,565.62 × 238,657.80
  4. Step 4: Simplify right side
    420,011.40x = 138,317,855,824.84
  5. Step 5: Solve for x
    x = 138,317,855,824.84/420,011.40
  6. Step 6: Final answer
    x = 329,319.29

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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.