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Finding the Fourth Proportional to 691,808.40, 954,550.44 and 420,019.38

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Solution

The fourth proportional to 691,808.40, 954,550.44 and 420,019.38 is: 579,538.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    691,808.40 : 954,550.44 = 420,019.38 : x
  2. Step 2: Convert to fraction form
    691,808.40/954,550.44 = 420,019.38/x
  3. Step 3: Cross multiply
    691,808.40x = 954,550.44 × 420,019.38
  4. Step 4: Simplify right side
    691,808.40x = 400,929,683,987.53
  5. Step 5: Solve for x
    x = 400,929,683,987.53/691,808.40
  6. Step 6: Final answer
    x = 579,538.62

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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.