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Finding the Fourth Proportional to 526.30, 787.89 and 389.95

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Solution

The fourth proportional to 526.30, 787.89 and 389.95 is: 583.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    526.30 : 787.89 = 389.95 : x
  2. Step 2: Convert to fraction form
    526.30/787.89 = 389.95/x
  3. Step 3: Cross multiply
    526.30x = 787.89 × 389.95
  4. Step 4: Simplify right side
    526.30x = 307,237.71
  5. Step 5: Solve for x
    x = 307,237.71/526.30
  6. Step 6: Final answer
    x = 583.77

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.