Finding the Fourth Proportional to 390,657.39, 539,128.17 and 218,565.09
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Solution
The fourth proportional to 390,657.39, 539,128.17 and 218,565.09 is: 301,631.56
Step by Step Solution
- Step 1: Write the proportion equation
390,657.39 : 539,128.17 = 218,565.09 : x - Step 2: Convert to fraction form
390,657.39/539,128.17 = 218,565.09/x - Step 3: Cross multiply
390,657.39x = 539,128.17 × 218,565.09 - Step 4: Simplify right side
390,657.39x = 117,834,596,997.59 - Step 5: Solve for x
x = 117,834,596,997.59/390,657.39 - Step 6: Final answer
x = 301,631.56
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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.