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Finding the Fourth Proportional to 720,047.80, 1,078,905.30 and 615,071.80

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Solution

The fourth proportional to 720,047.80, 1,078,905.30 and 615,071.80 is: 921,611.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,047.80 : 1,078,905.30 = 615,071.80 : x
  2. Step 2: Convert to fraction form
    720,047.80/1,078,905.30 = 615,071.80/x
  3. Step 3: Cross multiply
    720,047.80x = 1,078,905.30 × 615,071.80
  4. Step 4: Simplify right side
    720,047.80x = 663,604,224,900.54
  5. Step 5: Solve for x
    x = 663,604,224,900.54/720,047.80
  6. Step 6: Final answer
    x = 921,611.35

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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.