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Finding the Fourth Proportional to 608.77, 840.10 and 346.78

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Solution

The fourth proportional to 608.77, 840.10 and 346.78 is: 478.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    608.77 : 840.10 = 346.78 : x
  2. Step 2: Convert to fraction form
    608.77/840.10 = 346.78/x
  3. Step 3: Cross multiply
    608.77x = 840.10 × 346.78
  4. Step 4: Simplify right side
    608.77x = 291,329.74
  5. Step 5: Solve for x
    x = 291,329.74/608.77
  6. Step 6: Final answer
    x = 478.56

Related Problems

Find fourth proportional to 304.38, 420.05 and 173.39
Half scale
Find fourth proportional to 1,217.53, 1,680.19 and 693.56
Double scale
Find fourth proportional to 609.77, 841.48 and 347.78
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.