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Finding the Fourth Proportional to 570.84, 787.80 and 423.90

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Solution

The fourth proportional to 570.84, 787.80 and 423.90 is: 585.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.84 : 787.80 = 423.90 : x
  2. Step 2: Convert to fraction form
    570.84/787.80 = 423.90/x
  3. Step 3: Cross multiply
    570.84x = 787.80 × 423.90
  4. Step 4: Simplify right side
    570.84x = 333,948.42
  5. Step 5: Solve for x
    x = 333,948.42/570.84
  6. Step 6: Final answer
    x = 585.01

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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.