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Finding the Fourth Proportional to 712,739.86, 983,605.50 and 390,449.88

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Solution

The fourth proportional to 712,739.86, 983,605.50 and 390,449.88 is: 538,834.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    712,739.86 : 983,605.50 = 390,449.88 : x
  2. Step 2: Convert to fraction form
    712,739.86/983,605.50 = 390,449.88/x
  3. Step 3: Cross multiply
    712,739.86x = 983,605.50 × 390,449.88
  4. Step 4: Simplify right side
    712,739.86x = 384,048,649,442.34
  5. Step 5: Solve for x
    x = 384,048,649,442.34/712,739.86
  6. Step 6: Final answer
    x = 538,834.25

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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.