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Finding the Fourth Proportional to 669.99, 924.57 and 390.26

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Solution

The fourth proportional to 669.99, 924.57 and 390.26 is: 538.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.99 : 924.57 = 390.26 : x
  2. Step 2: Convert to fraction form
    669.99/924.57 = 390.26/x
  3. Step 3: Cross multiply
    669.99x = 924.57 × 390.26
  4. Step 4: Simplify right side
    669.99x = 360,818.07
  5. Step 5: Solve for x
    x = 360,818.07/669.99
  6. Step 6: Final answer
    x = 538.54

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1.5x scale

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.