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Finding the Fourth Proportional to 528, 790.65 and 390.84

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Solution

The fourth proportional to 528, 790.65 and 390.84 is: 585.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    528 : 790.65 = 390.84 : x
  2. Step 2: Convert to fraction form
    528/790.65 = 390.84/x
  3. Step 3: Cross multiply
    528x = 790.65 × 390.84
  4. Step 4: Simplify right side
    528x = 309,017.65
  5. Step 5: Solve for x
    x = 309,017.65/528
  6. Step 6: Final answer
    x = 585.26

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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.