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Finding the Fourth Proportional to 451,648.81, 621,710.72 and 390,366.84

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Solution

The fourth proportional to 451,648.81, 621,710.72 and 390,366.84 is: 537,353.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    451,648.81 : 621,710.72 = 390,366.84 : x
  2. Step 2: Convert to fraction form
    451,648.81/621,710.72 = 390,366.84/x
  3. Step 3: Cross multiply
    451,648.81x = 621,710.72 × 390,366.84
  4. Step 4: Simplify right side
    451,648.81x = 242,695,249,160.53
  5. Step 5: Solve for x
    x = 242,695,249,160.53/451,648.81
  6. Step 6: Final answer
    x = 537,353.91

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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.