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Finding the Fourth Proportional to 651.95, 899.79 and 390.01

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Solution

The fourth proportional to 651.95, 899.79 and 390.01 is: 538.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    651.95 : 899.79 = 390.01 : x
  2. Step 2: Convert to fraction form
    651.95/899.79 = 390.01/x
  3. Step 3: Cross multiply
    651.95x = 899.79 × 390.01
  4. Step 4: Simplify right side
    651.95x = 350,927.10
  5. Step 5: Solve for x
    x = 350,927.10/651.95
  6. Step 6: Final answer
    x = 538.28

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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.