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Finding the Fourth Proportional to 630.90, 945.55 and 283.87

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Solution

The fourth proportional to 630.90, 945.55 and 283.87 is: 425.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    630.90 : 945.55 = 283.87 : x
  2. Step 2: Convert to fraction form
    630.90/945.55 = 283.87/x
  3. Step 3: Cross multiply
    630.90x = 945.55 × 283.87
  4. Step 4: Simplify right side
    630.90x = 268,413.28
  5. Step 5: Solve for x
    x = 268,413.28/630.90
  6. Step 6: Final answer
    x = 425.45

Related Problems

Find fourth proportional to 315.45, 472.78 and 141.94
Half scale
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Double scale
Find fourth proportional to 631.90, 947.05 and 284.87
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.