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Finding the Fourth Proportional to 530.21, 790.81 and 520.99

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Solution

The fourth proportional to 530.21, 790.81 and 520.99 is: 777.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    530.21 : 790.81 = 520.99 : x
  2. Step 2: Convert to fraction form
    530.21/790.81 = 520.99/x
  3. Step 3: Cross multiply
    530.21x = 790.81 × 520.99
  4. Step 4: Simplify right side
    530.21x = 412,002.12
  5. Step 5: Solve for x
    x = 412,002.12/530.21
  6. Step 6: Final answer
    x = 777.05

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.