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Finding the Fourth Proportional to 570.30, 788.55 and 497.40

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Solution

The fourth proportional to 570.30, 788.55 and 497.40 is: 687.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    570.30 : 788.55 = 497.40 : x
  2. Step 2: Convert to fraction form
    570.30/788.55 = 497.40/x
  3. Step 3: Cross multiply
    570.30x = 788.55 × 497.40
  4. Step 4: Simplify right side
    570.30x = 392,224.77
  5. Step 5: Solve for x
    x = 392,224.77/570.30
  6. Step 6: Final answer
    x = 687.75

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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.