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Finding the Fourth Proportional to 717,017.12, 989,453.32 and 390,323.34

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Solution

The fourth proportional to 717,017.12, 989,453.32 and 390,323.34 is: 538,629.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,017.12 : 989,453.32 = 390,323.34 : x
  2. Step 2: Convert to fraction form
    717,017.12/989,453.32 = 390,323.34/x
  3. Step 3: Cross multiply
    717,017.12x = 989,453.32 × 390,323.34
  4. Step 4: Simplify right side
    717,017.12x = 386,206,722,928.82
  5. Step 5: Solve for x
    x = 386,206,722,928.82/717,017.12
  6. Step 6: Final answer
    x = 538,629.71

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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.