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Finding the Fourth Proportional to 451,641.42, 621,700.79 and 390,359.66

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Solution

The fourth proportional to 451,641.42, 621,700.79 and 390,359.66 is: 537,344.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,641.42 : 621,700.79 = 390,359.66 : x
  2. Step 2: Convert to fraction form
    451,641.42/621,700.79 = 390,359.66/x
  3. Step 3: Cross multiply
    451,641.42x = 621,700.79 × 390,359.66
  4. Step 4: Simplify right side
    451,641.42x = 242,686,903,945.83
  5. Step 5: Solve for x
    x = 242,686,903,945.83/451,641.42
  6. Step 6: Final answer
    x = 537,344.21

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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.