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Finding the Fourth Proportional to 520.03, 779.02 and 390.18

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Solution

The fourth proportional to 520.03, 779.02 and 390.18 is: 584.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    520.03 : 779.02 = 390.18 : x
  2. Step 2: Convert to fraction form
    520.03/779.02 = 390.18/x
  3. Step 3: Cross multiply
    520.03x = 779.02 × 390.18
  4. Step 4: Simplify right side
    520.03x = 303,957.78
  5. Step 5: Solve for x
    x = 303,957.78/520.03
  6. Step 6: Final answer
    x = 584.50

Related Problems

Find fourth proportional to 260.02, 389.51 and 195.09
Half scale
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Double scale
Find fourth proportional to 521.03, 780.52 and 391.18
Similar ratio
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1.5x scale

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.