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Finding the Fourth Proportional to 720,215.58, 993,870.66 and 397,918.77

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Solution

The fourth proportional to 720,215.58, 993,870.66 and 397,918.77 is: 549,113.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,215.58 : 993,870.66 = 397,918.77 : x
  2. Step 2: Convert to fraction form
    720,215.58/993,870.66 = 397,918.77/x
  3. Step 3: Cross multiply
    720,215.58x = 993,870.66 × 397,918.77
  4. Step 4: Simplify right side
    720,215.58x = 395,479,790,566.29
  5. Step 5: Solve for x
    x = 395,479,790,566.29/720,215.58
  6. Step 6: Final answer
    x = 549,113.07

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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.