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Finding the Fourth Proportional to 708,636.85, 977,876.71 and 402,670.77

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Solution

The fourth proportional to 708,636.85, 977,876.71 and 402,670.77 is: 555,661.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    708,636.85 : 977,876.71 = 402,670.77 : x
  2. Step 2: Convert to fraction form
    708,636.85/977,876.71 = 402,670.77/x
  3. Step 3: Cross multiply
    708,636.85x = 977,876.71 × 402,670.77
  4. Step 4: Simplify right side
    708,636.85x = 393,762,362,891.38
  5. Step 5: Solve for x
    x = 393,762,362,891.38/708,636.85
  6. Step 6: Final answer
    x = 555,661.71

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Double scale
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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.