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Finding the Fourth Proportional to 573.05, 788.76 and 478.76

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Solution

The fourth proportional to 573.05, 788.76 and 478.76 is: 658.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    573.05 : 788.76 = 478.76 : x
  2. Step 2: Convert to fraction form
    573.05/788.76 = 478.76/x
  3. Step 3: Cross multiply
    573.05x = 788.76 × 478.76
  4. Step 4: Simplify right side
    573.05x = 377,622.79
  5. Step 5: Solve for x
    x = 377,622.79/573.05
  6. Step 6: Final answer
    x = 658.98

Related Problems

Find fourth proportional to 286.52, 394.38 and 239.38
Half scale
Find fourth proportional to 1,146.09, 1,577.52 and 957.51
Double scale
Find fourth proportional to 574.05, 790.14 and 479.76
Similar ratio
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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.