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Finding the Fourth Proportional to 720,206.71, 993,925.13 and 397,909.89

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Solution

The fourth proportional to 720,206.71, 993,925.13 and 397,909.89 is: 549,137.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,206.71 : 993,925.13 = 397,909.89 : x
  2. Step 2: Convert to fraction form
    720,206.71/993,925.13 = 397,909.89/x
  3. Step 3: Cross multiply
    720,206.71x = 993,925.13 × 397,909.89
  4. Step 4: Simplify right side
    720,206.71x = 395,492,637,156.99
  5. Step 5: Solve for x
    x = 395,492,637,156.99/720,206.71
  6. Step 6: Final answer
    x = 549,137.68

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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.