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Finding the Fourth Proportional to 691.02, 1,038.72 and 555.54

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Solution

The fourth proportional to 691.02, 1,038.72 and 555.54 is: 835.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    691.02 : 1,038.72 = 555.54 : x
  2. Step 2: Convert to fraction form
    691.02/1,038.72 = 555.54/x
  3. Step 3: Cross multiply
    691.02x = 1,038.72 × 555.54
  4. Step 4: Simplify right side
    691.02x = 577,050.51
  5. Step 5: Solve for x
    x = 577,050.51/691.02
  6. Step 6: Final answer
    x = 835.07

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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.